<!-- <style type="text/css">
    .btn {
        width: 100px;
        height: 100px;
        text-align: center;
        font-size: 20px;
        color: #FFFFFF;
        /* line-height: 1.428571429; */
        border-radius: 50px;
        background-color: #0080FF;
        border: 1px solid #d5d5d5;
    }

    span.timeSpan {
        font-size: 15px;
    }
</style>
<script type="text/javascript">
    $(function () {
         $('#showCurrTime').html(getCurrentTime())
         
    });
</script>
<div style="text-align:center;">
    <button class="btn" id="dk_button" onclick="this.disabled=true; dk();">
        打卡<br />
        <span class="timeSpan" id="showCurrTime"></span>
    </button>
</div> -->